var element      = evt.target;
                var poly = element.shadowTree;
                var path    = poly.getElementById("drawing_arc");
                
                // get attributes from custom tag
		

		var cx = 0, cy = 0, r = 0, start = 0, sides = 0, cross = 1, units="degrees"
		nb_attributes = element.attributes.length
		for (i = 0; i < nb_attributes;i++)
		{
		attribute = element.attributes.item(i)
		switch(attribute.name)
			{case "cx" : cx = attribute.value - 0 ; break;
			 case "cy" : cy = attribute.value - 0 ; break;
			 case "r"  : r = attribute.value - 0 ; break;
			 case "start" : start = attribute.value - 0 ; break;
			 case "sides" : sides = attribute.value - 0 ; break;
			 case "cross" : cross = attribute.value - 0 ; break;
			 case "units" : units = attribute.value ; break;
			 case "onclick" : break;
			 case "onmousedown" : break;
			 case "onmousemove" : break;
			 case "onmouseup" : break;
			 case "onmousein" : break;
			 case "onmouseout" : break;
			 case "id" : break;
			 case "cursor" : break;
			 default : path.setAttributeNS(null, attribute.name, attribute.value)
			}
		}

		if (units == "degrees")
		start = start * Math.PI / 180

		if (start < 0)
		start = start + 2 * Math.PI

                // calculate d attribute for path
                var x_begin = cx + r * Math.cos(start);
		var y_begin = cy + r * Math.sin(start);
 		var angle = 2 * Math.PI / sides
		var string_d = "M" + x_begin.toString() + " " + y_begin.toString()
		var start_angle = start + angle * cross

		while (Math.abs(start_angle - start) > 0.1 )
		{
			x_current = cx + r * Math.cos(start_angle);
			y_current = cy + r * Math.sin(start_angle);
			string_d += "L" + x_current.toString() + " " + y_current.toString()
			start_angle = start_angle + angle * cross
			if (start_angle >= 2 * Math.PI - 0.1) 
			start_angle = start_angle - 2 * Math.PI 
		}

		string_d += "z"	
 
		

                // apply attributes
                path.setAttributeNS(null, "d", string_d);


		// add child ( as animate )
		if (element.hasChildNodes)
		{
			
			var number_childs = element.childNodes.length
			for (i = 0; i < number_childs; i++)
			if (element.childNodes.item(i) != null)
			{
			path.appendChild(element.childNodes.item(i).cloneNode("true"))
			}

		}